chapter 4: connectionsziarko/cs335/cs335_wz4.pdf · 2005. 3. 1. · 4 faxes • bit map used to...

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Chapter 4: Connections

Telephones

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Telephone Network

Cellular Grid

3

Cellular Connections

Faxes

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Faxes• Bit map used to represent a picture• Typical resolution of 200 dpi• Typical sheet requires about 3740000 dots (pixels)• It would about two minutes to send one sheet at 33.6 kbps

Transmission Modes

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Asynchronous Transmission

Asynchronous Transmission

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Synchronous Transmission

Communication Directions

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Interface Standards

EIA/RS232 Standard

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RS232 Standard Signaling

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Null Modem

Balanced vs. Unbalanced Signal

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X.21 Interface

X.21 Interface Signaling

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USB Connections

USB Wires

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USB Plugs

FireWire-IEEE 1394 Standard

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Data Strobe Encoding

Multiple FireWire Buses

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Multiplexing

Multiplexing Low Speed Devices

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Amplitude Modultion

Modulation Principles

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Frequency Division Multiplexing

Time Division Multiplexing

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Statistical Time Division Multiplexing

Wave Division Multiplexing

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Wave Division Multiplexing

T1 Digital Carrier DS1 Frame

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T1 Digital Carrier

Other Carriers

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Contention Protocols

No Protocol …

Contention Protocols

Protocol Present …

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Aloha Protocols

Pure Aloha vs. Slotted Aloha

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Pure Aloha vs. Slotted Aloha

CSMA and Aloha Protocols

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Collision Detection

Token Ring Network

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Summary of Contention Protocols